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Simulate constat flow rate trough a pipe

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Hi,

I would like to simulate a simple situation of laminar flow rate through a pipe. This pipe is a section of a tube which is a part of a closed circuit where a pump imposes a constant flow rate.
I was thinking to simulate this by simply drawing 2D axysimmetric rectangle and imposing at the inlet and outlet a laminar inflow/outflow with the same flow rate value.

However, when I try to do this, the solution does not converge.

Any tips on how to simulate a constant flow rate through a pipe?

Thanks in advance,
Kind Regards,

Simona

1 Reply Last Post 09.12.2016, 11:00 GMT-5
Jeff Hiller COMSOL Employee

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Posted: 8 years ago 09.12.2016, 11:00 GMT-5
Hello Simona,
Did you specify pressure anywhere?
If not, that could be at least part of the problem. Without a reference pressure set somewhere the Navier Stokes equation does not have a unique solution.
Best regards,
Jeff
Hello Simona, Did you specify pressure anywhere? If not, that could be at least part of the problem. Without a reference pressure set somewhere the Navier Stokes equation does not have a unique solution. Best regards, Jeff

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